body {
  background-color: #f2f3f3;
}

.w_75 {
  width: 75rem;
  margin: 0 auto;
}

.main-cooperation {
  width: 100%;
  position: relative;
  padding-bottom: 4rem;
  background-color: #f2f3f3;
  padding-top: 4rem;
}

.main-cooperation>div {
  width: 100%;
  position: relative;
}

.main-cooperation>img {
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.main-cooperation h2 {
  font-size: 3.5rem;
  line-height: 3.5rem;
  color: #000000;
  margin-bottom: 3.06rem;
  mix-blend-mode: overlay;
}

.main-cooperation .conent {
  width: 75rem;
  height: 50.88rem;
  margin: 0 auto;
  position: relative;
}

.main-cooperation .conent .form_conent {
  width: 72.5rem;
  height: 100%;
  background-color: #ffffff;
  position: relative;
  z-index: 10;
  margin: 0 auto;
  padding: 3.06rem 3.75rem 0;
}

.main-cooperation .cover {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate3d(-50%, -50%, 0);
  background-color: #ffffff;
}

.main-cooperation .cover1 {
  width: 73.75rem;
  height: 48.38rem;
  opacity: 0.6;
  z-index: 6;
}

.main-cooperation .cover2 {
  width: 75rem;
  height: 45.88rem;
  opacity: 0.2;
  z-index: 6;
}

.main-cooperation h3 {
  font-family: 'BodoniMTItalic';
  font-size: 2.5rem;
  line-height: 2.5rem;
  height: 2.5rem;
  margin-bottom: 3.06rem;
  font-weight: normal;
}

.main-cooperation form {
  flex-wrap: wrap;
}

.main-cooperation .item {
  margin-bottom: 15px;
}

.main-cooperation .item.w_100 {
  width: 100%;
}

.main-cooperation label {
  width: 3.75rem;
  height: 3.63rem;
  background-color: #4d4d4d;
  font-family: 'Arial';
  font-size: 1.1rem;
  line-height: 1.2rem;
  color: #ffffff;
  flex-shrink: 0;
}

.main-cooperation input {
  width: 28.13rem;
  height: 3.63rem;
  background-color: #ffffff;
  border: solid 1px #cccccc;
  font-family: 'Arial';
  font-size: 1rem;
  color: #b3b3b3;
  padding-left: 1.13rem;
}

.main-cooperation input::placeholder {
  color: #b3b3b3;
}

.main-cooperation .w_100>label {
  width: auto;
  font-size: 1rem;
  padding: 0 1rem;
}

.main-cooperation .project {
  width: 100%;
  height: 3.63rem;
  background-color: #ffffff;
  border: solid 1px #cccccc;
  padding-left: 1.13rem;
}

.main-cooperation .project div {
  cursor: pointer;
  font-family: 'Arial';
  font-size: 1rem;
}

.main-cooperation .project div:nth-child(2) {
  margin: 0 5rem;
}

.main-cooperation .project span {
  width: 1.13rem;
  height: 1.13rem;
  background-color: #ffffff;
  border: 3px solid #eeeeee;
  box-shadow: inset 0px 0px 5px 0px rgba(128, 128, 128, 0.75);
  border-radius: 1.13rem;
  margin-right: 1rem;
  flex-shrink: 0;
}

.main-cooperation .project div.active span {
  background-color: #aa0021;
}

.main-cooperation .remark label {
  height: 120px;
}

.main-cooperation textarea {
  width: 100%;
  height: 14.06rem;
  background-color: #ffffff;
  border: solid 1px #cccccc;
  resize: none;
  font-size: 1rem;
  color: #b3b3b3;
  padding: 1.19rem;
  line-height: 1.4rem;
  font-family: 'Arial';
}

.main-cooperation textarea::placeholder {
  color: #b3b3b3;
}

.main-cooperation .btn {
  width: 12.5rem;
  height: 3rem;
  background-color: #aa0021;
  font-size: 1.13rem;
  font-weight: 700;
  color: #ffffff;
  margin: 2.5rem auto 0;
}

@media (max-width: 880px) {
  .w_75 {
    width: 100%;
    padding: 0 0.5rem;
  }

  .go_back {
    height: 5rem;
  }

  .go_back div a {
    font-size: 1.5rem;
  }

  .main-cooperation h2 {
    margin-bottom: 1.2rem;
  }

  .main-cooperation .conent {
    width: 100%;
    height: auto;
  }

  .main-cooperation .cover1 {
    width: 95%;
    height: 95%;
    opacity: 0.6;
    z-index: 6;
  }

  .main-cooperation .cover2 {
    width: 100%;
    height: 90%;
    opacity: 0.2;
    z-index: 6;
  }

  .main-cooperation .conent .form_conent {
    width: 90%;
    padding: 2.06rem 1.25rem 1.5rem;
  }

  .main-cooperation .item {
    width: 100%;
  }

  .main-cooperation input {
    width: 100%;
  }
  .main-cooperation .w_100{
    align-items: stretch;
  }
  .main-cooperation .w_100>label{
    height: auto;
  }

  .main-cooperation .project {
    justify-content: space-around;
    padding-left: .5rem;
        flex-wrap: wrap;
        height: auto;
        justify-content: flex-start;
  }

  .main-cooperation .project div:nth-child(2) {
    margin: 0;
  }
}